All of the ridiculous necromancy and positive energy questions got me thinking about baelnorn, deathless, and other good-aligned liches somehow animated through positive energy (yes, canonically so). Now my brain hurts because those never made sense in the first place and I tried forgetting about them. That pain insults my honor! I demand satisfaction! (Slaps anons with glove.)
Right. Ugh. I guess my shorthand answer is weird elf magic.